The former head of the British Army's chemical weapons unit says Western allies should be giving the Ukrainian army more aircraft to target strategic Russian sites.

Hamish De Bretton-Gordon told Sky News that while chemical and biological weapons were internationally illegal, their use was part of the so-called 'Russian playbook' and Putin was taking heart from the West's failure to prosecute Assad after he used chemical weapons in Syria.

He spoke to Niall Paterson.

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